BibTool 2.68

• Handling of extracting by aux file improved.
• Record extended by attribute lineno.
  This attribute carries the line number of the initiating @.
• The format of the error messages has been slightly streamlined.
  Double spaces are avoided; two colons in one message are avoided.
• The format of the messages of check_rule include file and line
  number.
• Warning for double fields added.
• The empty output file is used to signal that the output should be
  suppressed.
• The resources check.warning.rule and check.error.rule
  have been introduced to allow semantic checks to be classified as
  warning or error.
• The behaviour of the resource check.double has been
  generalized. The requirement that double entries to be adjacent
  has been dropped. This has the impact that the processing is
  slightly slower.
• New resource file unique.field introduced. With this
  resource it is possible to specify additional unique constraints
  for fields. If different records have the same value for one of
  those fields then a warning is issued.
• Static library renamed from libbib.a to libbibtool.a.

BibTool 2.67

• Treatment of empty values for key separators fixed.
• Resource parse.exit.on.error added to force a stop when a parsing error is encountered. The default is false, i.e. an error recovery is attempted.
• Error messages for parsing resource arguments improved. The usual pointer is used there as well.
• Documentation extended to cover the exit codes of BibTool.
• Some updates in the documentation files for the new TeX live: removing old font commands.

BibTool_2_66

• lib/biblatex.rsc fixed.
• Resource keep.field added to get rid of unknown fields.
• Internal memory management rewritten to get rid of unused memory
  some time in the future. For now just the C code is changed
  incompatibly if the macro COMPLEX_SYMBOL is defined upon
  compilation.
• Refactoring applied to make use of the C99 feature stdbool.h.

BibTool_2_65

This is a bugfix release for crossref related functions on some 32-bit architectures.
BibTool-2.65.zip

BibTool_2_64

• Crossref mapping introduced
• xdata extraction introduced
  BibTool-2.64.tar.gz

BibTool_2_63

Omission of the previous release fixed.

BibTool_2_62

Combined rewrite and delete bug fixed.
Minor improvements for the distribution.
README renamed to README.md to comply with the conventions of the GitHub repository.

BibTool_2_61

This release contains a new resource rename.field.
Some improvements are also contained.

BibTool_2_60

next alpha

BibTool 2.47

BibTool_2_47

reorg and cleanup